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    vs.      
Ken Obata is tied in the series against Masashi Ishii, 1-1.

event round table player one result player two
Grand Prix Tokyo 201631484Obata, Ken (1462)Lost 1-2Ishii, Masashi (1386)
Grand Prix Chiba 20197651Obata, Ken (1522)Won 2-0Ishii, Masashi (1459)